Gregor-Fors, Ian Mac, et al. “Note on the Distribution and Migration of the Black-Capped Vireo (Vireo Atricapilla)”. Huitzil Revista Mexicana De Ornitologí­a, vol. 13, no. 1, Jan. 2012, pp. 17-21, https://doi.org/10.28947/hrmo.2012.13.1.142.